# Title Team Members TA Documents Sponsor
50 Smart Black/Whiteboard Cleaning System
Lan Li
Yichen Gu
Luke Wendt design_document0.pdf
Although powerpoint is widely used in presentation nowadays, black/whiteboards are still not replaceable in some situations. After a long presentation or lecture, it is very possible for the presenter to forget cleaning the board. It is OK if the board is filled with lecture notes. But if the it is confidential information, there will be a problem. Also it is a hassle for professors to clean up the black board every time it is all written.

We would like to design a cheap black/whiteboard cleaning system. By simply waving a hand at a motion sensor mounted beside the blackboard, the brush will go from one side to the pin location you previously put on, and travel back, brushes 2 times in total. More details and functionality are presented below.

Technical Details:
This project will contain three modules:

Brush module: A vertically placed brush pressed to the board.

Motor module: Sliding rail on top and bottom of the board. 2 motors on each side of the rail to drag a wire attached to the rail, to move the brush.

Control module: This module contains three different submodules.
Wave-Clean: An ultrasonic sensor on the side of board, facing upwards. When presenter wave his/her hand at the sensor, board is cleaned.
Leave-Clean: Motion sensors around the room. When no movement for 5mins, clean the board
Partial-Clean: Presenter can put a locating pin on the rail. The brush will then move from the side to the pin, and only cleans part of the board.

It will also include a small rechargeble battery pack to power the motor.

Control System and User Interface for Hydraulic Bike

Iain Brearton

Featured Project

Parker-Hannifin, a fluid power systems company, hosts an annual competition for the design of a chainless bicycle. A MechSE senior design team of mechanical engineers have created a hydraulic circuit with electromechanical valves, but need a control system, user interface, and electrical power for their system. The user would be able to choose between several operating modes (fluid paths), listed at the end.

My solution to this problem is a custom-designed control system and user interface. Based on sensor feedback and user inputs, the system would change operating modes (fluid paths). Additionally, the system could be improved to suggest the best operating mode by implementing a PI or PID controller. The system would not change modes without user interaction due to safety - previous years' bicycles have gone faster than 20mph.

Previous approaches to this problem have usually not included an electrical engineer. As a result, several teams have historically used commercially-available systems such as Parker's IQAN system (link below) or discrete logic due to a lack of technical knowledge (link below). Apart from these two examples, very little public documentation exists on the electrical control systems used by previous competitors, but I believe that designing a control system and user interface from scratch will be a unique and new approach to controlling the hydraulic system.

I am aiming for a 1-person team as there are 6 MechSE counterparts. I emailed Professor Carney on 10/3/14 and he thought the general concept was acceptable.

Operating modes, simplified:

Direct drive (rider's pedaling power goes directly to hydraulic motor)

Coasting (no power input, motor input and output "shorted")

Charge accumulators (store energy in expanding rubber balloons)

Discharge accumulators (use stored energy to supply power to motor)

Regenerative braking (use motor energy to charge accumulators)

Download Competition Specs:

Team using IQAN system (top right corner):

Team using discrete logic (page 19):